Caloriesto Joule Converter
Instantly convert caloriesto joule with our free converter. See conversion tables, formulas, and step-by-step explanations.
Formula
Joules = cal x 4.184 | Joules = kcal x 4184 | kJ = kcal x 4.184
Calorie-to-joule conversion uses the thermochemical definition where 1 cal = 4.184 J exactly. One food Calorie (kilocalorie) equals 4184 joules or 4.184 kilojoules. All energy conversions go through the joule as the base SI unit, multiplying by the source factor and dividing by the target factor.
Worked Examples
Example 1: Food Energy to Joules
Problem: A meal contains 650 kilocalories (food Calories). Convert to joules, kilojoules, and BTU.
Solution: Joules = 650 x 4184 = 2,719,600 J\nKilojoules = 2,719,600 / 1000 = 2,719.6 kJ\nBTU = 2,719,600 / 1055.06 = 2,578.1 BTU\nThis is about one-third of a typical daily intake.
Result: 650 kcal = 2,719,600 J = 2,719.6 kJ = 2,578 BTU
Example 2: Chemistry Lab Conversion
Problem: A reaction releases 500 calories of heat. Express in joules and kilojoules.
Solution: Joules = 500 x 4.184 = 2,092 J\nKilojoules = 2,092 / 1000 = 2.092 kJ\nNote: this is 500 small calories (0.5 kcal), not food Calories.
Result: 500 cal = 2,092 J = 2.092 kJ
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